The autopsy showed the age of the baby to be "near-term," meaning the infant was born before its due date, but was not pre-mature. Erwin said no other information, including the sex of the baby, will be released because of the ongoing investigation.

"If it's a local person we probably will know, but I guess it could be somebody from anywhere," Newcastle resident Walter Morgan said.

Anyone who may known a recently pregnant woman, who is no longer pregnant and does not have a baby, asked to call call the sheriff's office at (530) 889-7800 or Placer County Crime Stoppers at 1-800-923-8191. Tips can remain anonymous